Bees usually swam when the old hive gets too small, that is, after a good season with few casualties and lots of pollen and nectar. The workers create a new queen bee for the old hive, and the old queen flies off with the swarm after the workers have located a good spot.
It's amazing how quickly they can establish a good hive if the conditions are favourable. I would imagine a BBQ under cover must be 'good conditions' for bees. lol
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